摘要
通过对新建立的海南岛上泥盆统昌江组及其下石炭统南好组多重地层的综合研究 ,并以首次发现的南好组底部的河流相砾岩和砂砾岩为标志 ,指出海南岛在泥盆纪末期曾发生大规模海退事件 ,这恰好与泥盆纪—石炭纪之交的全球海平面下降事件完全一致。不仅确认了昌江组与南好组为平行不整合接触关系 ,而且两者以I型层序界面相隔分别构成 2个三级层序 ,因而认为海南岛泥盆—石炭纪年代地层界线已与层序界面重合为一个共同的分界面———平行不整合面。
Based on a multiple stratigraphic division of the new built Changjiang and Nanhao Formations in ages of Late Devonian and Early Carboniferous respectively,and the potamogenic conglomerate and pebbly sandstone firstly discoveried at Jishichun, Changjiang Li autonomous County of Hainan Province,the paper presented a short term eustatic fall of sea level occurring during the end of Devonian in Hainan Island,which was very well correlated with the pulsative fall of sea level across Devonian and Carboniferous boundary all over the world. It was confirmed that the Changjiang Formation and the Nanhao Formation were not only contacted by a parallel unconformity,but also separated by I type sequence boundary between two third order sequences. Therefore, the Devonian Carboniferous chronostratigraphic boundary should be coincident with the sequence boundary and the disconformity.
出处
《地质科学》
CAS
CSCD
北大核心
2002年第3期313-319,T003,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金 (编号 :4 9972 0 94 )
地质行业科技发展基金 (编号 :HY97982 0 )资助项目。
